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Is Bifen IT safe to use near well water?

Also, I have sprayed this on an underground yellow jacket nest, and they are still at this location.

Answer:

Per the product label, the soil around a well can be treated with Bifen IT. You can treat up to three feet away from the well.

With Bifen IT, the label states that when you are treating for yellow jackets, spray the nest opening in the ground, bushes, and in cracks and crevices where the insects may nest. Saturate the openings and contact as many insects as possible. Please let us know if you have any additional questions.